Diagnostic Trouble codes

ZGhost! · 06-21-2021, 02:31 PM

Touble codes on my 2010 370z

Can anyone help out on this, My Z is in Limp mode. I have changed out computer for the VVEL, still an issue
I see I am having issues with communications
U1000 CAN communications Line Signal Malfunction

M56_AT
U1003 Lost Communications with VVEL control Module
P1606 VVEL Control Module Malfunction
P1421 Cold Start Control

I have taken out and cleaned each fuse and relay under the hood as well with electrical cleaner. Does any one have the 370z grounds diagram?

SouthArk370Z · 06-21-2021, 04:57 PM

Wiring diagrams, connector pinouts, wire colors, etc are in the FSM. Link in my sig.

ZGhost! · 09-21-2021, 09:28 AM

I have replaced the VVEL module, both relays, cleaned the 2-Cam sensors. Same two codes P1606 and U1003. I am reading about the negative battery post and the screw could be causing the issues. Also consider the ECM was even remapped.

SonicVQ · 09-21-2021, 11:55 AM

Assuming that the replacement VVEL module is good, I would focus on the wiring. Verify the module has 12v on pin 1, 8 and 13 with ignition on, engine off. Make sure to use the ground on pin 14.

Pins 11 and 24 are the dedicated CAN bus that runs from the ECU to the VVEL module.
• With the battery disconnected, the resistance between pins 11 and 24 should be around 60 ohms. This verifies the CAN bus wires and proper bus termination.

• With the battery connected and engine running, check the voltage between pin 11 + 14 (ground) and pin 24 + 14 (ground)

You should see around 2.2V for CAN-Low and 2.7V for CAN-High.

06-21-2021, 02:31 PM	#1 (permalink)
ZGhost! Base Member Join Date: Apr 2021 Location: Kentucky Posts: 2 Drives: 2010 370z White auto Rep Power: 4	Diagnostic Trouble codes Touble codes on my 2010 370z Can anyone help out on this, My Z is in Limp mode. I have changed out computer for the VVEL, still an issue I see I am having issues with communications U1000 CAN communications Line Signal Malfunction M56_AT U1003 Lost Communications with VVEL control Module P1606 VVEL Control Module Malfunction P1421 Cold Start Control I have taken out and cleaned each fuse and relay under the hood as well with electrical cleaner. Does any one have the 370z grounds diagram? Last edited by ZGhost!; 06-21-2021 at 03:12 PM.

06-21-2021, 04:57 PM	#2 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	Wiring diagrams, connector pinouts, wire colors, etc are in the FSM. Link in my sig. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

09-21-2021, 11:55 AM	#4 (permalink)
SonicVQ Base Member Join Date: Jan 2016 Location: Ontario Posts: 230 Drives: G37 Sport Rep Power: 6720	Assuming that the replacement VVEL module is good, I would focus on the wiring. Verify the module has 12v on pin 1, 8 and 13 with ignition on, engine off. Make sure to use the ground on pin 14. Pins 11 and 24 are the dedicated CAN bus that runs from the ECU to the VVEL module. • With the battery disconnected, the resistance between pins 11 and 24 should be around 60 ohms. This verifies the CAN bus wires and proper bus termination. • With the battery connected and engine running, check the voltage between pin 11 + 14 (ground) and pin 24 + 14 (ground) You should see around 2.2V for CAN-Low and 2.7V for CAN-High. sx moneypit likes this.

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09-21-2021, 09:28 AM	#3 (permalink)
ZGhost! Base Member Join Date: Apr 2021 Location: Kentucky Posts: 2 Drives: 2010 370z White auto Rep Power: 4	I have replaced the VVEL module, both relays, cleaned the 2-Cam sensors. Same two codes P1606 and U1003. I am reading about the negative battery post and the screw could be causing the issues. Also consider the ECM was even remapped.